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Finding the Fourth Proportional to 1,037.74, 1,431.51 and 644.68

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Solution

The fourth proportional to 1,037.74, 1,431.51 and 644.68 is: 889.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,037.74 : 1,431.51 = 644.68 : x
  2. Step 2: Convert to fraction form
    1,037.74/1,431.51 = 644.68/x
  3. Step 3: Cross multiply
    1,037.74x = 1,431.51 × 644.68
  4. Step 4: Simplify right side
    1,037.74x = 922,865.87
  5. Step 5: Solve for x
    x = 922,865.87/1,037.74
  6. Step 6: Final answer
    x = 889.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.